In Treatise on Febrile Diseases, Zhang Zhongjing put forward the theory that "human life begins with the source of Jingxue", and thought that human life and vitality originated from the source of Jingxue, that is, Jingxue produced by human viscera. Only by nourishing the internal organs and regulating the essence and blood can we maintain the health and vitality of the human body.

Zhang Zhongjing is one of the main authors of Treatise on Febrile Diseases, which is an important medical work in the history of ancient Chinese medicine and an important milestone in the history of Chinese medicine.